瓦斯对冲击性煤样能量耗散的影响

基于煤的冲击倾向性分类及指数测定方法，进行了不同瓦斯压力下煤样冲击倾向性测定，应用能量积聚与耗散的方法，分析了不同瓦斯压力环境中煤样单轴压缩与循环加卸载过程中能量积聚与耗散关系。研究表明：随着瓦斯压力的增大，煤样的冲击倾向性指数减小，冲击倾向性降低；煤样破坏前储存的弹性能降低，破坏时耗散能增率呈非线性快速降低趋势；在循环载荷作用下，煤样在相同循环中耗散能随着瓦斯压力的增加而增加。在不考虑瓦斯膨胀能的情况下，瓦斯压力的增加降低了煤层冲击地压的破坏性。因此，高瓦斯矿井在深部开采中进行冲击倾向性评价时应考虑瓦斯因素。

Impact of energy dissipation of coal samples with rockburst tendency from gas in its failure process

Based on the measurement standards of rock burst tendency of coal samples,it has been measured under different gas pressures.The methods of energy accumulation and dissipation were applied to analyze the relationship between energy accumulation and dissipation of coal samples under the conditions of uniaxial compression and uniaxial cyclic loading and unloading in different gas pressures.The results show that with the increase of gas pressure,the indexes of every rock burst tendency are constantly reduced,and their outburst-proneness are decreased.Before destruction,the elastic energy stored is reduced,while the gaining rate of dissipated energy decreases rapidly in the form of nonlinear relationship during destruction.Under cyclic loading,the dissipated energy of coal samples in each cycle increases along with the increase of gas pressure.Gas reduces the destructive impact of coalbed rockburst,but when considering the expansion energy of gas,the overall destruction can be more serious.Therefore,gas should be considered when the rockburst tendency is evaluated in high gassy coal mines.